Replacement Battery for Milwaukee 2.4v 6538-1 6539-1 48-11-0100 replacement 2500MAH Battery by TITAN Power Tool Battery for Mulwaukee 2.4 V 2000mAh Nicd 109% Compatible with original manufacturer equipments and chargers 2 Year Warranty integrated microchip prevents overcharging & lengthens battery life 4.3 x 2.1 x 2.1 inches